438 
ARBELA TETRAONIS, Moore. 
THE CASUARINA BARK-EATING CATERPILLAR, 
Plate XXVI,. 
References :—Moore, P. Z, S. 1879, p. 411, pl. a4, fig. 3; C. & S. 
No. 1605, Hmpsn., Faun. Br. Ind. Moths, I, 315, 
No. 675. 
Classification :—Order, LEPIDOPTERA. Sub-Order HETEROCERA, 
Family, Arbelide. 
Tree attacked :—Casuarina equisetifolia. The Casuarina. 
This is the insect whose caterpillar forms the well-known 
winding covered-way galleries on the outside of the bark of 
the stem and branches of Casuarina trees. 
Larva.—Head black, witha few longish yellowish-white hairs 
on it, Following three segments, which each bears a pair of 
long legs, yellowish, this colour merging into pink on the third 
These three segments are swollen and larger than the head. 
The following segments are flesh-coloured except the last, 
which is yellowish. Five pairs of short sucker legs are present, 
one pair each on the sixth to ninth anda pair on the last 
A few long scattered whitish hairs on each of the 
segments. These nine segments are narrower than the first 
three and taper off slightly behind, so that the twelfth segment 
has only about half the diameter of the fourth. Length one 
and-a-half inch. Width of thoracic segments 3th inch. Plate 
XXVI, fig. a, shows the larva, side and dorsal view. 
Pupa.—Yellowish-brown except in front, where it is very 
dark-brown to black. Shining, circular in section and of 
uniform thickness throughout, except for aslight swelling at 
the anterior (head) end which is furnished with two small 
spiny spikes. The wing covers are very short and reddish- 
brown. The last five abdominal segments have transverse 
segment. 
circular rows of fine teeth on them, the first three segments — 
bearing a double row on each placed close together, the last 
two having butasingle encircling girdle situated near the 
